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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 8153
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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why does not honeywell thermostat screen go blank when i switch

Customer Question

why does not honeywell thermostat screen go blank when i switch to ac? the thermostat screen works fine in the heating and off position.
Submitted: 5 years ago.
Category: HVAC
Expert:  Phil replied 5 years ago.

Phil :

All work to be done by licensed professional. WE KEEP GOING UNTIL YOU HAVE THE INFORMATION YOU NEED, I come and go. This is step ONE.

Phil :

Hello

Phil :

Defective electronics inside the thermostat is the 99% most likely cause....

Phil :

we can do a few tests to prove if thats actually the case or not.

Phil :

Test #1 follow the the thermostat wires where they come out of the wall next to the furnace or air handler

Phil :

remove the service panel there, by lifting it up and pulling it out

Phil :

tell me what colors the thermostat wires are attached in side the unit.

Phil :

We can go from there

Phil :

Phil

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